The band's first summer-time release, "Identity" was an upbeat song featuring Latin percussion and lyrics about self-identity.

[13] "Me ga Aku Aiiro", a complicated seven-minute rock opera, had been the final song that the band worked on for Kikuuiki, with recording sessions lasting until February 16, a month before the album's release.

For "Me ga Aku Aiiro", Yamaguchi felt that he needed to develop a new style of lyric writing for himself, featuring abstract concepts but words that people would still empathise with.

[13] The first part of the song was inspired by an incident where Yamaguchi was watching people carry out their daily lives.

[23] While Yamaguchi said this as a joke, he felt that this was true for where the band were in their career (like Southern All Stars, who were able to produce many high response singles after "Katte ni Sinbad", such as "Itoshi no Ellie" (1979)).

The song's protagonist says that going by measures such as what his favourite clothes, books and food are, he's just a regular person, and that him thinking about the morning's rain that led to a woman's shirt becoming set were inelegant thoughts.

The DVD edition featured a recording of five songs taken from the band's performance at Shinkiba Studio Coast on May 15, 2010.

[33] The single featured two additional tracks, the B-side "Holy Dance" and a remix of "Yes No" from Kikuuiki created by Aoki Takamasa.

Conceptually, Yamaguchi thought of the single as a piece of fruit, with "Identity" acting as the skin, "Holy Dance" the flesh and "Yes No (Aoki Takamasa Remix)" the pit.

[8] The video features scenes of the band performing the song in a dark room, back-lit with a series of fluorescent tubes.

[44] Kitazawa was inspired by pachinko machines, strongly associated with a "dirty mood" as they are gambling devices, however when seen outside of context are innocent game cabinets.

Kitazawa felt that how the identity of what a pachinko machine is changes depending on the conceptions of people, and that this expressed the messages of the song well.

[46] CDJournal reviewers gave the single their star of approval, calling it the "highest [level of] pop music" and a future anthem for Sakanaction.

[47] They praised the "radical but considered electro sound" and the "dancable" four on the floor beat, also describing the Latin percussion was "fresh".

[47] The reviewers felt that the song's melody was so high quality that it would sound good even backed with just a guitar.

[47] Yuichi Hirayama of Excite described the song as "a radical pop tune that rides on tribal dance beats, while questioning the nature of identity", while Sumire Hanatsuka of Skream!

[48][49] Tetsuo Hiraga of Hot Express described the song as "a flood of sound, an emotional explosion, a pleasurable Latin beat, and a melody and lyrics that make you want to scream.

[51] Rival sales tracking agency SoundScan Japan found that the vast majority of copies sold in the first week were of the single's limited CD/DVD edition.

[51] All tracks are written by Ichiro YamaguchiPersonnel details were sourced from Documentaly's liner notes booklet.